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Compressibility effects on the structure of supersonic mixing layers: experimental results

Published online by Cambridge University Press:  26 April 2006

S. Barre ,
C. Quine  and
J. P. Dussauge
S. Barre
Affiliation:
Institut de Mécanique de Marseille, Institut de Mécanique Statistique de la Turbulence, U.M. CNRS-Université Aix-Marseille II no 380033, 12 avenue de Général Leclerc, 13003 Marseille, France
C. Quine
Affiliation:
Institut de Mécanique de Marseille, Institut de Mécanique Statistique de la Turbulence, U.M. CNRS-Université Aix-Marseille II no 380033, 12 avenue de Général Leclerc, 13003 Marseille, France
J. P. Dussauge
Affiliation:
Institut de Mécanique de Marseille, Institut de Mécanique Statistique de la Turbulence, U.M. CNRS-Université Aix-Marseille II no 380033, 12 avenue de Général Leclerc, 13003 Marseille, France
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Abstract

An experiment in a supersonic mixing layer at convective Mach number Mc = 0.62 was performed to study the evolution of a flow from a turbulent boundary layer to a fully developed mixing layer. Turbulence measurements were taken and are interpreted with a diffusion model, which is well adapted to these flows. These measurements show that the level of turbulent friction varies with Mc proportionally to the spread rate. Our measurements appear to be consistent with the spreading rate of the layer and suggest that compressibility does not significantly alter the diffusion scheme at Mc = 0.62. This is also confirmed by a review of the existing data. Moreover, in the present flow, the anisotropy of the turbulent stresses seems to be affected by compressibility. The evolution of the radiated noise shows an increase corresponding to the developed part of the layer. Quantitative assessments of compressibility effects on turbulent quantities are given and are related to modifications in the structure of the flow.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 259 , 25 January 1994 , pp. 47 - 78
Copyright
© 1994 Cambridge University Press

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